Heat duty, heat of absorption, sensible heat and heat of vaporization of 2–Amino–2–Methyl–1–Propanol (AMP), Piperazine (PZ) and Monoethanolamine (MEA) tri–solvent blend for carbon dioxide (CO2) capture

Chikezie Nwaoha, Raphael Idem, Teeradet Supap, Chintana Saiwan, Paitoon Tontiwachwuthikul, Wichitpan Rongwong, Jaber Al Marri, Abdelbaki Benamor

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28 Citations (Scopus)


Chemical absorption using reactive amines for carbon dioxide (CO2) capture is characterized by absorption heat, heat of desorption and heat duty for regeneration (Qreg, kJ/mol CO2). This study experimentally investigated the heat duty of tri–solvent blends containing AMP–PZ–MEA and the individual contribution of desorption heat, sensible heat and heat of vaporization to heat duty. The experimental conditions for absorption were 15 v/v% CO2 at 40 °C and atmospheric pressure while desorption was carried out 90 °C for loaded amine also at atmospheric pressure. The heat of desorption was experimentally determined using the specific heat capacity (kJ/kg °C) difference between the CO2 free and CO2 saturated amine solutions at the stated absorption conditions. Results showed that the heat duty of all the tri–solvent blends was significantly lower than that of the standard 5 kmol/m3 MEA. Interestingly, the AMP–PZ–MEA tri–solvent blends exhibited only slightly lower heats of absorption when compared to MEA; however, they also showed significantly lower sensible heat and slightly lower heat of vaporization. Consequently, the tri–solvent blends exhibited significantly lower heat duties than the standard 5 kmol/m3 MEA. In addition, a model analogous to a power law kinetic model was developed and used to predict the specific heat capacity of the AMP–PZ–MEA tri–solvent blends. The model accurately predicted the experimental results with an AAD of 0.59%. The overall results highlight the potential of using AMP–PZ–MEA blends for CO2 capture.

Original languageEnglish
Pages (from-to)26-35
Number of pages10
JournalChemical Engineering Science
Publication statusPublished - 12 Oct 2017
Externally publishedYes



  • Absorption heat
  • Heat duty
  • MEA, PZ and AMP
  • Modeling
  • ProMax 4.0® simulation
  • Sensible heat
  • Specific heat capacity
  • Vaporization heat

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Applied Mathematics

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